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You checked the fuse and relay, did you check to see if you had power at the resistor ?American built vehicles control fan speed by the power circuit which goes thru the resistor. The high speed usually bypasses the resistor.You may need a new blower motor or control switch.

9 out of 10 times its the heater fan resistor doing this. it has wires that corresponed to diffreent speed settings for heater fan. the resistor is beside the blower motor, Your Kia Sportage Blower Motor Resistor controls the heating equipment in the
vehicle by opening and closing the fan motor. The Kia Sportage Blower Motor
Resistor allows the heating and climate control system to control the speed of
the vehicle's cooling fan. its under the passenger side glove box. undo 2 screws and disconnect the electrical connector. thats it!!

REPLACE THERMOSTAT.IF ALREADY DONE.CHECK HEATER BLOWER MOTOR SEE IF POWER GOING TO HEATER BLOWER MOTOR.IF YES BLOWER MOTOR BAD.IF NO POWER GOING TO BLOWER MOTOR CHECK AC AND HEATER CONTROL FUSE AND CHECK BLOWER MOTOR FUSE AND RELAY IF ALL IS GOOD CHECK SEE IF POWER GOING TO AC AND HEATER CONTROL SWITCH IF YES THE AC AND HEATER CONTROL SWITCH COULD BE BAD.

That model of car has alot of electrical systems that can cause heavy load on the system. Blower motor on highspeed, headlamps, power windows ,ect.... instead of turning engine off ,try to eliminate the load and see if that helps. I would suspect a weak ,or too small of a battery ,or the altenator
is not working at full capacity

Using a new seal, position the heater blower motor and blower motor wheel assembly to the heater blower motor housing with the flat side of the flange near the heater blower motor switch resistor (18591). Install the four retaining screws.

Tape the heater blower motor power lead to the air inlet duct to keep the wire away from the blower outlet during installation.

Install the heater blower motor and blower motor wheel assembly in the vehicle.

Check the fuse or the circuit breaker.?Remove wires at the blower motor.One will be the ground wire,black,in color?? the other will be the hot.If there is only one then the motor is grounded by its mounting. Check wiring diagram.for colors or use an inline fuse 20 amps. in the power test lead Run a ground wire to the other. A premade set of test leads are very helpful.This will test the motor.The fuse may blow if the leads are reversed or the motor is shorted,or draws too much current.If motor tests ok,repair the open.Test the switch and the high speed relay,then the resistor packl All with finction of the blower switch.No slow speeds,bad resistor pack or switch,check resistor(visually),no high speed with switch?Bad highspeed relay. A wiring diagram will be of help,in checking points in the circuit where the color code is used.Without a diagram is a guessing game and takes more time.